stealthyPronunciation: /ˈstɛlθi/Translate stealthy | into French | into German | into Italian | into Spanish Definition of stealthy adjective (stealthier, stealthiest) behaving or done in a cautious and surreptitious manner, so as not to be seen or heard:stealthy footstepsDerivatives stealthily adverb stealthiness noun stealthy in other Oxford dictionaries Definition of stealthy in the US English dictionary